A 6-year-old girl with autism spectrum disorder is being evaluated for associated features and comorbidities. Her parents note anxiety symptoms, sensory sensitivities, and occasional seizure-like episodes. Which of the following is NOT commonly associated with autism spectrum disorder?

Explanation

## Associated Features and Comorbidities in Autism Spectrum Disorder ### High-Yield Comorbidities **Key Point:** While ASD commonly co-occurs with several conditions, bipolar I disorder is NOT a typical primary psychiatric diagnosis in children with ASD. Anxiety and depression are far more prevalent. ### Intellectual Disability **High-Yield:** Approximately 30% of individuals with ASD have co-occurring intellectual disability. This means 70% have average or above-average intelligence. The severity of ASD and presence of intellectual disability are independent dimensions. ### Anxiety Disorders **Clinical Pearl:** Anxiety is one of the most common comorbidities in ASD, affecting 40–50% of individuals. Anxiety may manifest as: - Social anxiety (fear of social situations) - Generalized anxiety - Specific phobias - Obsessive-compulsive symptoms (distinct from restricted interests) Anxiety often increases with age and is particularly prevalent in adolescents and adults with ASD. ### Seizure Disorders **High-Yield:** Seizures occur in 5–10% of individuals with ASD, with higher rates in those with co-occurring intellectual disability. Seizure onset is often in early childhood or adolescence. ### Bipolar I Disorder and ASD **Warning:** Bipolar I disorder is NOT a characteristic comorbidity of ASD in children. While mood dysregulation can occur in ASD, true bipolar I disorder (with distinct manic and depressive episodes) is not significantly more common in ASD than the general population. This is a common diagnostic trap—irritability and emotional dysregulation in ASD are often mistaken for bipolar disorder, leading to incorrect diagnosis and inappropriate treatment with mood stabilizers. ### Comparison Table: Common Comorbidities in ASD | Condition | Prevalence | Notes | | --- | --- | --- | | Intellectual disability | ~30% | Independent of ASD severity | | Anxiety disorders | 40–50% | Most common psychiatric comorbidity | | ADHD | 30–50% | Often co-occurs; may share genetic factors | | Seizure disorders | 5–10% | Higher with intellectual disability | | Depression | 10–20% | More common in adolescents/adults | | Bipolar I disorder | Not elevated | NOT a typical ASD comorbidity | | OCD | 5–15% | Obsessions distinct from restricted interests | [cite:DSM-5 Diagnostic and Statistical Manual of Mental Disorders]